MINNEAPOLIS -- Minnesota Twins shortstop Andrelton Simmons has tested positive for the coronavirus and was placed on the COVID-19 injured list Wednesday before the team's doubleheader against the Boston Red Sox.

Simmons has said he doesn't plan to get the COVID-19 vaccine, which was made available in a single-shot dosage to the team at Target Field last Thursday.

Twins president of baseball operations Derek Falvey said Simmons was experiencing "very mild" symptoms and resting at home. The positive test result was received late Tuesday, after the Twins lost 4-2 to the Red Sox.

After the initial phase of contact tracing, the Twins determined no additional players needed to be quarantined.

Simmons was replaced on the roster by infielder JT Riddle, who was summoned from the alternate training site. Third baseman Josh Donaldson, out since the season opener with a strained hamstring, was expected back for the second game of the doubleheader.

The Twins held a meeting to remind players and staff to heed virus protocols, even though a majority of them have been vaccinated. The full immunization period isn't in effect yet.

"We're not out of the woods by any means on that front," Falvey said, adding, "Now is the time to be as vigilant as possible."

Simmons tweeted last month that he would not be getting the vaccine or advocating for it for "personal reasons and past experience," on which he declined to elaborate. He confirmed Sunday that he did not participate in the teamwide vaccination. Asked if he planned to get the shot in the future, Simmons said he didn't know.

"We want to continue to educate people in the environment. This is real. This is something that can enter. We know that," Falvey said. "Sometimes no one really knows exactly how it can come at different times. We know that from looking not just across our sport, but across all sports and across the country and the world. Our view of that is constantly reminding people of why we think it's a good idea to get vaccinated. Our docs have recommended that, and so we continue to provide them as resources to players, to learn as much as they can about this."